Premium Carbon Steel Materials: Needle files are made of carbon steel which has high hardness which are available in different profiles and cuts. The fine grain of the file set is deeply hardened and coated for long-lasting cutting performance. Various Design Choices: The needle file set includes round, tapered and half round, barrette, cross, knife, leveling, corset and three square files. Ten different patterns of metal hand files increase the application ranges. Ergonomic and comfortable handle: The ergonomic handles of the small metal files provide a comfortable feeling during use. A stable grip helps you get the job done faster. The handle is firm and you can control it stably. Wide Application: Small hardened steel files can be used to remove, refine, reshape and scrape projects, including filing, shaping, deburring, setting, chamfering, smoothing and finishing metals, wood, plastic and polymer clay. They are ideal for shaping wood, metal, jewelry, mirror, glass, tile, ceramic, leather and plastic that require precision work on small surfaces and narrow areas.